Set of key buttons for a handset



FIG. 1 is a front view of set of key buttons for a handset showing my new design;

FIG. 2 is a perspective front view thereof;

FIG. 3 is a front view thereof in a closed position; and,

FIG. 4 is a perspective view thereof in a closed position.

The broken line showing the remainder of the handset is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design of set of key buttons for a handset, as shown and described. 